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Collection: Directories and Documents > Pamphlets
Effects of the Truckee, California Earthquake of September 12, 1966 (PH 15-16b)(1967) (25 pages)
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Page: of 25
6 EFFECTS OF TRUCKEE, CALIFORNIA, EARTHQUAKE OF SEPT. 12, 1966
westbound lane bridge failed by slumping. This fill
consists of decomposed granite that was displaced
about 314 ft southward at the surface; the depth
of displacement extended to at least 4 ft.
Little or no damage oceurred to the bridges
from Union Mills east to Floristan. The approaches
to the bridges at Floristan and between Union
Mills and Boea, however, settled.
The south abutment of the Prosser Creek bridge
on Highway 89 just west of Prosser Reservoir was
damaged slightly. This damage consisted primarily
of spalling of the conerete, probable displacement
of the south abutment about half an inch to the
west, and cracks in the west eurb.
HIGHWAYS
Artificial fill along a 3-mile section of Interstate
Highway 80 southeast of Boca Reservoir locally
slumped during the earthquake. The longest of
these slumps was a 1,100-ft section near Hinton
that failed along the cut-fill contact and resulted
in displacements of as much as 6 in. horizontally
and 10 in. vertically (figs. 10 and 11). The several
smaller failures along the 3-mile section southeast
of Boca Reservoir were chiefly in the eastbound or
outer lanes or in filled sections of the highway. The
failures occurred at the cut-fill contact.
Additional damage along Interstate Highway 80
was caused by boulders as large as 10 by 10 by 8
it that fell along cuts especially where the highway
passes over or through talus deposits.
RAILROADS
The Southern Pacifie Lines suffered both physical damage and downtime because of the earthquake. Between Boca and the California-Nevada
boundary boulders fell onto the rails and halted
the westbound traffic. Impact of some of the
boulders locally displaced the tracks about 2 in.
horizontally. Boulders also reportedly fell on a 10by 12-ft snowshed and damaged the structure; the
exact location of the structure is unknown but was
reported by Southern Pacifie personnel to be in the
Truckee Canyon between Boca and the California-Nevada boundary.
The railway roadbed was displaced both vertically and horizontally where it traverses loose fill
over the stream flowing from Boca Reservoir. The
tracks here required both realinement and repeated regrading. Mr. Reuben Acala reported that the '
30°
: pa
Upstream
Impervious
Selected well-graded
/SST
core
compacted fill
im Ga
FIGURE 5.—Cross section of Prosser Dam showing location and inferred extent of cracks in dam.